<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
</head>

<body>
    <div id="app">
        {{message}} {{message + message}}
        <div :id="message"></div>
        <!-- <ul>
            <todo-item v-for="item in list" :title="item.title" :del="item.del"></todo-item>
        </ul> -->
        <todo-list>
            <todo-item @delete="handleDelete" v-for="item in list" :title="item.title" :del="item.del">
                <template v-slot:pre-icon="{value}">
                    <span>前置图标 {{value}}</span>
                </template>

            </todo-item>
        </todo-list>
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>
    <script>
        Vue.component('todo-item', {
            props: {
                title: String,
                del: {
                    type: Boolean,
                    default: false,
                },
            },
            template: `
            <li>
                <slot name="pre-icon" :value="value"></slot>
                <span v-if="!del">{{title}}</span>
                <span v-else style="text-decoration: line-through">{{title}}</span>
                <slot name="suf-icon">😄</slot>
                <button v-show="!del" @click="handleClick">删除</button>
            </li>
          `,
            data: function() {
                return {
                    value: Math.random()
                }
            },
            methods: {
                handleClick(e) {
                    console.log('点击删除按钮')
                    this.$emit('delete', this.title)
                }
            },
        })
        Vue.component('todo-list', {
            template: `
            <ul>
              <slot></slot>
            </ul>
          `,
            data: function() {
                return {

                }
            },
        })
        var vm = new Vue({
            el: '#app',
            data: {
                message: 'hello world',
                list: [{
                    title: '课程1',
                    del: false
                }, {
                    title: '课程2',
                    del: true
                }],
            },
            methods: {
                handleDelete(val) {
                    console.log('handleDelete', val)
                }
            }
        })
    </script>
</body>

</html>